@import url('https://fonts.googleapis.com/css2?family=Work+Sans:wght@500;700&display=swap');

body {
  margin: 0;
  font-family: 'Work Sans', sans-serif;
  background: linear-gradient(rgba(10, 10, 30, 0.75), rgba(0, 20, 40, 0.85)),
    url('https://images.pexels.com/photos/256262/pexels-photo-256262.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260') no-repeat center center fixed;
  background-size: cover;
  color: #f2f8ff;
  display: flex;
  justify-content: center;
  padding: 60px 20px;
  min-height: 100vh;
}

.st-container {
  background-color: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  padding: 50px 60px;
  border-radius: 20px;
  max-width: 900px;
  animation: fadeSlideIn 1.5s ease-in-out;
  box-shadow: 0 0 40px rgba(100, 180, 255, 0.2);
}

header {
  text-align: center;
  margin-bottom: 35px;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  color: #d0eaff;
  text-shadow: 0 0 12px #50b5ff;
}

.back-link {
  color: #d0eaff;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  margin-top: 10px;
  display: inline-block;
  border-bottom: 2px solid transparent;
  transition: border 0.3s;
}
.back-link:hover {
  border-bottom: 2px solid #50b5ff;
}

h2 {
  color: #9cdfff;
  border-bottom: 2px solid #50b5ff;
  padding-bottom: 5px;
  margin-top: 30px;
  font-weight: 600;
}

.intro p {
  font-size: 1.2rem;
  line-height: 1.7;
  color: #e2f5ff;
  margin-bottom: 25px;
}

.video-section iframe {
  width: 100%;
  max-width: 560px;
  height: 315px;
  margin: 0 auto 40px;
  display: block;
  border-radius: 16px;
  box-shadow: 0 0 30px #50b5ffaa;
}

.key-points ul {
  font-size: 1.1rem;
  padding-left: 25px;
  color: #e9f6ff;
}

.key-points li {
  margin-bottom: 12px;
}

/* Animation */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}